EXP Computer C4077-90960 - Manual (Page 303)

Possible Cause Recommended Action
1. Toner supply is low. Shake the cartridge gently to redistribute the
toner, or replace the cartridge.
2. Print Density is set incorrectly. Change to a darker setting and retry printing.
3. EconoMode is on. EconoMode saves toner by
reducing the dot density. This may appear to be
a print quality problem in some cases. Turn EconoMode off. Verify that EconoMode is
not being enabled by either the printer driver or
the job application.
4. Paper does not meet specs. The moisture
content, conductivity, or surface finish may not
work correctly with the electrophotographic
process. Try a different paper lot (see HP LaserJet Printer
Family Paper Specifications Guide).
5. Transfer Roller is defective or incorrectly
installed. If the Transfer Roller loses conductivity,
it cannot effectively pull toner from the drum to
the paper. Inspect the Transfer Roller for proper installation
and contact. If the Transfer Roller is damaged,
replace it.
6. Laser/Scanner door is not opening properly. 1. Remove and re-seat the toner cartridge.
2. Check the Laser/Scanner shutter door for
proper operation. If defective, replace the
Laser/Scanner Assembly.
7. High voltage contact springs are dirty or
defective. The high voltage contacts are
mounted on the High Voltage Power Supply PCA
and protrude into the toner cartridge cavity. Check the contacts for functionality. If dirty, clean
using alcohol; if damaged, replace the High
Voltage Power Supply PCA.
8. High Voltage Power Supply PCA is defective. Replace the High Voltage Power Supply PCA.
9. DC Controller PCA is defective. The DC
Controller supplies the proper voltage to the
High Voltage Power Supply PCA. Replace the DC Controller PCA.
Table 7-8 Fading Print
7-66